JQL
Newbie level 6
Gonzakpo said:Ok. Here I am again. RA3 = 2.4V - VPP-GEN=9.34V
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just a little update, now I'm having these readings:
**broken link removed**
Hello Gonza
I'm always giving your clone my attention.
"First of all check the voltage using multimeter on 18F877's RA3 pin (5th), and on the VPP-GEN rail.", potyo's word, is important.
First is to affirm the state of detection system. Here inconsiderate of that for the moment, if VPP_GEN's and VPP's values are correct.
If VPP_GEN's value by multimeter is approximately equal to VPP's value by MPLAB ICD2, then show that for us, the scale relation of 2.2k and 6.8k is normal, and MPLAB ICD2's detection is right.
Or else, check these resistors.
VPP_GEN / V_RA3 = (6.8k + 2.2k) / 2.2k = 9 / 2.2
(R5=6.8k, R11=2.2k in your Protel SCH)
if VPP_GEN = 13.0v, then V_RA3 = 3.18v
if V_RA3 = 2.4v, then VPP_GEN = 9.82v
Second is to correct VPP_GEN's value.
Check 10k, 1.5k, 2.2k resistors and other doubted place.
(R4=10k, R9=1.5k,R10=2.2k in your Protel SCH)
I wish you success.
JQL
2007.08.12